SOLUTION: Parents sometimes yell at their children for leaving the light on in their bedroom when they aren't in the room. If the child's room is lit with two 10 watt bulbs for one extra hou

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Question 993561: Parents sometimes yell at their children for leaving the light on in their bedroom when they aren't in the room. If the child's room is lit with two 10 watt bulbs for one extra hour a day for everyday of the year (365), and the cost of energy is $0.068 per kilowatt*hour (kWh), how much money is wasted on lighting that isn't being used, to the nearest cent
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
two 10 watt buls equals a total of 20 watts.

20 watts is equal to 20 / 1000 = .02 kilowatts.

.02 kilowatts burning for 1 hour a day for 365 days is equal to 7.3 kilowatt hours.

.068 dollars per kilowatt hours * 7.3 kilowatts is equal to .4964 dollars.

the total cost for the year would be .4964 dollars which is equal to 49.64 cents which rounds off to 50 cents or a half a dollar.